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Standard NATO symbol for a regiment of several battalions, indicated by the III. The shape, colour and pattern indicate friendly infantry.

A regiment is a title used by some military units. The size of a regiment varies markedly, depending on the country and the arm of service.

Originally the term "regiment" simply denoted a large body of men under a single leader.[1] Historically, in the 17th century, a full-strength regiment was hypothetically a thousand men commanded by a colonel.

Today, there is no set size for a unit calling itself a "regiment", which may be:


  • Historical origin 1
  • Regimental system 2
    • Advantages and disadvantages 2.1
  • Commonwealth armies 3
    • British Army 3.1
    • Armour 3.2
    • Artillery 3.3
    • Infantry 3.4
    • Corps 3.5
  • United States Army 4
  • United States Marine Corps 5
  • Russian Army 6
  • Soviet Armed Forces 7
    • Motorised Rifle Regiment 7.1
    • Tank Regiment 7.2
    • Artillery Regiment 7.3
    • SAM Regiment 7.4
    • Antiaircraft Artillery Regiment 7.5
  • Irish Army 8
  • See also 9
  • References 10

Historical origin

The French term régiment is considered to have entered military usage in monarchs or countries. Later, it was customary to name the regiment by its precedence in the line of battle, and to recruit from specific places, called cantons. The oldest regiments which still exist, and their dates of establishment, include the Spanish 9th Light Infantry Regiment “Soria” (originally the Tercio de Nápoles)[2] (1505), Swedish Life Guards (1521), the British Honourable Artillery Company (1537) and the King's Own Immemorial Regiment of Spain, first established in 1248 during the conquest of Seville by King Ferdinand the Saint.[3]

In the 17th century, brigades were formed as units combining infantry, cavalry, and artillery that were more effective than the older, single-arms regiments; in many armies, brigades replaced regiments.

By the beginning of the 18th century, regiments in most European continental armies had evolved into permanent units with distinctive titles and uniforms, each under the command of a colonel. When at full strength an infantry regiment normally comprised two field battalions of about 800 men each or 8-10 companies. In some armies an independent regiment with a smaller amount of companies was labelled a demi-regiment.[4] A cavalry regiment numbered 600 to 900 troopers, making up a single entity.[5] On campaign, these numbers were soon reduced by casualties and detachments and it was sometimes necessary to amalgamate regiments or to withdraw them to a depot while recruits were obtained and trained.

With the widespread adoption of conscription in European armies during the nineteenth century, the regimental system underwent modification. Prior to World War I, an infantry regiment in the French, German, Russian, and other smaller armies would comprise four battalions, each with a full strength on mobilization of about 1,000 men. As far as possible, the separate battalions would be garrisoned in the same military district, so that the regiment could be mobilized and campaign as a 4,000 strong linked group of sub-units. A cavalry regiment by contrast made up a single entity of up to 1,000 troopers. A notable exception to this practice was the British line infantry system where the two regular battalions constituting a regiment alternated between "home" and "foreign" service and seldom came together as a single unit.

Regimental system

The Royal Regiment of Fusiliers on parade in England

In the regimental system, each regiment is responsible for recruiting, training, and administration; each regiment is permanently maintained and therefore the regiment will develop its unique esprit de corps because of its unitary history, traditions, recruitment, and function. Usually, the regiment is responsible for recruiting and administrating all of a soldier's military career. Depending upon the country, regiments can be either combat units or administrative units or both.

This is often contrasted to the "continental system" adopted by many armies. In the continental system, the division is the functional army unit, and its commander is the administrator of every aspect of the formation: his staff train and administer the soldiers, officers, and commanders of the division's subordinate units. Generally, divisions are garrisoned together and share the same installations: thus, in divisional administration, a battalion commanding officer is just another officer in a chain of command. Soldiers and officers are transferred in and out of divisions as required.

Some regiments recruited from specific geographical areas, and usually incorporated the place name into the regimental name. In other cases, regiments would recruit from a given age group within a nation (e.g. Zulu Impis), an ethnic group (e.g. the Gurkhas), or foreigners (e.g. the French Foreign Legion). In other cases, new regiments were raised for new functions within an army; e.g. the Fusiliers, the Parachute Regiment (British Army), and the U.S. Army 75th Ranger Regiment.

Disadvantages of the regimental system are hazardous regimental competition, a lack of interchangeability between units of different regiments, and more pronounced "old boy networks" within the military that may hamper efficiency and fairness.

A key aspect of the regimental system is that the regiment or battalion is the fundamental tactical building block. This flows historically from the colonial period, when battalions were widely dispersed and virtually autonomous, but is easily adapted to a number of different purposes. For example, a regiment might include different types of battalions (e.g. infantry or artillery) of different origins (e.g. regular or reserve).

Within the regimental system, soldiers, and usually officers, are always posted to a tactical unit of their own regiment whenever posted to field duty. In addition to combat units, other organizations are very much part of the regimental family: regimental training schools, serving members on "extra-regimental employment", regimental associations (retirees), bands and associated cadet groups. The aspects that an administrative regiment might have in common include a symbolic colonel-in-chief (often a member of the royal family), a colonel of the regiment or "honorary colonel" who protects the traditions and interests of the regimental family and insists on the maintenance of high standards, battle honours (honours earned by one unit of an administrative regiment are credited to the regiment), ceremonial uniforms, cap badges, peculiarities of insignia, stable belts, and regimental marches and songs. The regiment usually has a traditional "home station" or Regimental depot, which is often a historic garrison that houses the regimental museum and regimental headquarters. The latter has a modest staff to support regimental committees and administer both the regular members and the association(s) of retired members.

Advantages and disadvantages

The regimental system is generally admired for the esprit de corps it engenders in its units' members, but efforts to implement it in countries with a previously-existing continental system usually do not succeed. The system presents difficulties for military planners, who must deal with the problems of trying to keep soldiers of a regiment together throughout their careers and of administering separate garrisons, training and mess facilities. The regimental community of serving and retired members often makes it very difficult for planners to restructure forces by moving, merging or re-purposing units.

In those armies where the continental system exists, the regimental system is criticised as parochial and as creating unnecessary rivalry between different regiments. The question is also raised as to whether it is healthy to develop soldiers more loyal to their regiment than to the military in general. Regiments recruited from areas of political ferment (such as Scotland, Wales, Ireland, Quebec, India, etc.), tend to perform particularly well because of the loyalty their members exhibit to the regiments. Generally, the regimental system is found to function best in countries with small-to medium-sized military forces where the problems of administering vast numbers of personnel are not as prevalent. The regimental system works particularly well in an environment in which the prime role of the army consists of small-scale police actions and counterinsurgency operations, requiring prolonged deployment away from home. In such a situation, co-ordination between regiments is rarely necessary, and the esprit de corps of the regiment provides an emotional substitute for the sense of public approval that an army receives at home. This is particularly relevant to British experience during the days of the empire, where the army was virtually continuously engaged in low-intensity conflict with insurgents, and full-scale warfare was the exception rather than the rule.

A regimental system can also foster close links between the regiment and the community from which it is recruited. This sense of community 'ownership' over local regiments can be seen in the public outcry over recent regimental amalgamations in the United Kingdom. On the other hand, recruitment from a single community can lead to a concentrated and potentially devastating local impact if the regiment takes heavy casualties.

Further, the regimental system offers the advantage of grouping like units together for centralized administrative, training, and logistical purposes, thereby creating an “economies of scale” effect and its ensuing increased efficiency.

An illustrative example of this is the modular integration employed by the United States Marine Corps, which can take elements from its regimentally grouped forces and specifically tailor combined arms task forces for a particular mission or the deployed Marine Expeditionary Units (MEU). This is achievable partially because of the Marines mission adaptability, flexibility, philosophy, shared culture, history and overall esprit de corps, which allows for near seamless interoperability.[6]

Commonwealth armies

In the British Army and armies modeled on it (such as the Australian, the New Zealand, the Canadian, the Indian and the Pakistani), the term regiment is used confusingly in two different ways: it can mean an administrative identity and grouping, or a tactical unit. In the former Dominion of Newfoundland, "Regiment" was used to describe the entirety of the fighting armed forces, such as the Royal Newfoundland Regiment.

In the Commonwealth countries listed above, the large administrative regiment has been the normal practice for many years. In the case of India, "large regiments" of four to five battalions date from 1923 and, since the 1950s, many of these have expanded even further. As an example, the Punjab Regiment has expanded from four battalions in 1956 to its present strength of 20, while, in Pakistan, several regiments have over 50 battalions.

In Canada, the regiment is a formation of one or more units; existing almost exclusively for reasons of heritage, the continuance of battle honors and esprit de corps. Most Canadian infantry regiments are reserve units composed entirely of one under-strength battalion of between 100-250 soldiers. The three regular force infantry regiments each consist of three regular force battalions of approximately 600 soldiers, in addition to one or more reserve battalions. Canadian battalions are employed tactically and administratively within mechanized brigade groups for regular units, or light brigade groups for reserve units.

In Australia, there is but one administrative infantry regiment in the regular army: the Royal Australian Regiment, consisting of all seven regular infantry battalions in the Army, including mechanized, motorized, light, and parachute infantry. The Australian Army Reserve also has state-based infantry regiments which administer the reserve infantry battalions.

In Pakistan, the word regiment is an administrative grouping. While individual battalions may have different roles (for example different battalions of the Frontier Force Regiment may be mechanized infantry, paratroop infantry, or mountain troops), the regiment is considered to encompass all of them.

British Army

Regimental badge of the Scots Guards.

The modern British regimental system came about as a result of the 19th century Cardwell Reforms.

In the Honourable Artillery Company, established in 1537. The Royal Scots, formed in 1633, was the oldest infantry regiment. It now forms part of the Royal Regiment of Scotland.[7]

In the United Kingdom, there existed until recently a number of administrative "divisions" in the infantry that encompassed several regiments, such as the Guards Division, the former Scottish Division (now a single regiment), or the Light Division (now also compressed into a multi-battalion single regiment). The reduction and consolidation of British infantry regiments that began in the late 1950s and concluded in 2006 has resulted in a system of administrative regiments each with several battalions, a band, a common badge and uniform etc.

In the British regimental system, the tactical regiment or battalion is the basic functional unit and its commanding officer more autonomous than in continental systems. Divisional and brigade commanders generally do not immerse themselves in the day-to-day functioning of a battalion – they can replace the commanding officer but will not micro-manage the unit. The regimental sergeant major is another key figure, responsible to the CO for unit discipline and the behaviour of the NCOs.

It should however be noted that amalgamations beginning in the late 1950s and ending in 2006 have diluted the British regimental system through the now almost universal adoption of "large regiments" for the infantry of the Army. As of 2014, only thirteen line infantry regiments survive, each comprising up to six of the former battalions that previously had separate regimental status. Only the five Guards regiments retain their historic separate identities.


Régiment blindé du Canadae12. The only administrative armoured regiment of the British Army that consists of more than one tactical regiment is the Royal Tank Regiment, which currently has two (1 and 2 RTR), and once had many more. These two tactical regiments will soon be amalgamated into a single regiment.


All of a nation's artillery units are considered part of a single administrative regiment, but there are typically several tactical artillery regiments. They are designated by numbers, names or both. For example, the tactical regiments 1st Regiment, Royal Canadian Horse Artillery, 7th Toronto Regiment, RCA and many others are part of the single administrative regiment The Royal Regiment of Canadian Artillery. In Britain, the Royal Regiment of Artillery works in the same way.


Administrative infantry regiments are composed of one or more battalions. When a regiment has only one battalion, the battalion may have exactly the same name as the regiment. For example, The North Saskatchewan Regiment is the only battalion in the administrative regiment of the same name. When there is more than one battalion, they are distinguished by numbers, subsidiary titles or both. In Britain, every infantry battalion bears a number, even if it is the only remaining battalion in the regiment (in that case it is the 1st Battalion, with the exception of The Irish Regiment of Canada, which has a 2nd Battalion only). Until after the Second World War, every regiment had at least two battalions. Traditionally, the regular battalions were the 1st and 2nd Battalions, the militia (later Special Reserve) battalion was the 3rd Battalion, and the Army Reserve battalions were the 4th Battalion, the 5th Battalion and up. A few regiments had up to four regular battalions and more than one militia battalion, which disrupted the numbering, but this was rare. For this reason, although the regular battalion today (if there is only one) will always be the 1st Battalion, the TA battalions may have non-consecutive numbers.

In practice, it is impossible to exercise all the administrative functions of a true regiment when the regiment consists of a single unit. Soldiers, and particularly officers, cannot spend a full career in one battalion. Thus in the Armoured Corps, the traditional administrative "regiment" tends to play more of a ceremonial role, while in practice, its members are administered by their corps or "branch" as in the Artillery. Thus soldiers and officers can serve in many different "regiments", changing hat badges without too much concern during their career. Indeed, in the artillery, all regiments wear the same badge.


The British Army also has battalion-sized tactical regiments of the Royal Engineers, Royal Corps of Signals, Army Air Corps, Royal Logistic Corps, and Royal Military Police.

United States Army

The Puerto Rican 65th Infantry Regiment's bayonet charge against a Chinese division during the Korean War.

The United States Army was also once organized into regiments, but in the 20th century the division became the tactical and administrative unit. Industrial management techniques were used to draft, assemble, equip, train and then employ huge masses of conscripted civilians in very short order, starting with minimal resources.

Historically, a regiment consisted of four, later three battalions and the regiment headquarters (HQ) company. Training, administration and even tactical employment was centered at divisional level. Many, but not all combat support and logistics was also concentrated at that level.

A new system, the divisions, brigades, and battalions. Each battalion carries an association with a parent regiment, even though the regimental organization no longer exists. In some brigades several numbered battalions carrying the same regimental association may still serve together, and tend to consider themselves part of the traditional regiment when in fact they are independent battalions serving a brigade, rather than a regimental, headquarters.

The CARS was replaced by the United States Army Regimental System (USARS) in 1981.

There are exceptions to USARS regimental titles, including the Armored Cavalry Regiments (now defunct) and the 75th Ranger Regiment created in 1986. On 1 October 2005, the word "regiment" was formally appended to the name of all active and inactive CARS and USARS regiments. So, for example, the 1st Cavalry officially became titled the 1st Cavalry Regiment.

United States Marine Corps

Marine infantry, field artillery, and combat logistics forces are organized into regiments, commanded by a colonel. Marine infantry and field artillery regiments are sequentially numbered and are referred to generically as "Marines" or "Marine Regiment," as in 1st Marines (an infantry regiment) or 12th Marine Regiment (a field artillery regiment). Marine infantry regiments consist of a regimental Headquarters and Service Company (H&S Co) and three identical infantry battalions. Marine field artillery regiments consist of a regimental Headquarters and Service Battery (H&S Bttry), a Target Acquisition Battery, and from two to four field artillery battalions.

Marine Logistics Groups (MLG) contain two types of regiments; one Headquarters (HQ) Regiment (except 4th MLG) and two Combat Logistics Regiments (CLR). Each of these two types of regiments contain a Headquarters Company and varying numbers and types of logistics battalions and separate logistics companies, depending upon whether the regiment's primary mission is to provide direct support to (1) a Regimental Combat Team (RCT) or a Marine Amphibious Unit (MEU), or (2) provide general support across the Marine Expeditionary Force (MEF), including intermediate ground logistics support to Marine aviation units. These varying types of battalions and separate companies include: Combat Logistics, Maintenance, and Supply battalions, and Combat Logistics, Communications, Food Service, and Service companies (the latter three types in 3rd MLG only).

The HQ Regiments (whose primary mission includes providing support to the MEUs) are not numbered; however, the CLRs are numbered according to their primary mission. CLRs that support RCT's have the same number as the parent Marine Division of its supported RCT. Therefore, CLR 2 supports the RCTs of the 2nd Marine Division. CLRs that provide general maintenance and supply support to the MEF are designated by a two-digit number, the first digit is the Hindu-Arabic numeral equivalent of the MEFs Roman numeral designation and the second digit is always an arbitrarily assigned numeral "5." Therefore, the CLR that provides general maintenance and supply support to III MEF is CLR 35.

The United States Marine Corps deploys battalions from its infantry regiments to form the nucleus of a Battalion landing Team (BLT) as the Ground Combat Element (GCE) of a Marine Expeditionary Unit (MEU). However, a USMC infantry regiment may deploy en masse to form the nucleus of a Regimental Combat Team (RCT) or Regimental Landing Team (RLT) as the GCE of a Marine Expeditionary Brigade (MEB). In both cases the infantry component is reinforced with ground combat support forces including field artillery, reconnaissance, assault amphibian vehicle, light armored reconnaissance vehicle, tank, and combat engineer units. The resulting GCE is then combined with an Aviation Combat Element (ACE), a Logistics Combat Element (LCE), and a Command Element (CE) to form a Marine Air Ground Task Force (MAGTF).

Russian Army

The regiments (Russian: полк)[8] of the Russian Army, and armed forces influenced by Russia consist of battalions (Russian: батальон), in the infantry or tank troops, divisions (Russian: дивизион) in the artillery troops, and squadrons (Russian: эскадрилья) in aviation troops. Land forces regiments also include support units – companies (Russian: рота) and/or platoons (Russian: взвод).

Soviet Armed Forces

Motorised Rifle Regiment

The Motorised Rifle Regiment was one of the basic tactical units within the SA-9 or SA-13s and four ZSU-23-4 or 2S6 Tunguskas, an antitank missile battery with nine BRDM-mounted AT-3 Sagger or AT-5 Spandrel launchers, a reconnaissance company mounted on BMPs, BRDMs and motorbikes and an engineer company. Other non-combat formations included a signals company, chemical protection platoon, material support company, maintenance company, and regimental medical point.[9]

Tank Regiment

The Tank Regiment was found in both T-64, T-72, or T-80 tanks although some units used older models, and an artillery battalion of eighteen 2S1 Gvozdika self-propelled howitzers, with some using the older towed D-30 howitzer. Tank Regiments operating as part of a Tank Division included a fifth combat battalion of motorised infantry, identical to those in BMP-equipped Motorised Rifle Regiments. Combat support and combat service support subunits were the same as in Motorised Rifle Regiments with the exception of the antitank missile battery.[10][11]

Artillery Regiment

The Artillery Regiment was used to provide fire support, but differed depending on whether it was part of a Motorised Rifle Division or Tank Division. The artillery regiment of an MRD consisted of three battalions of eighteen 2S3 Akatsiyas each and a battalion of eighteen BM-21 Grads, numbering just under 1,300 personnel total, while a TD artillery regiment had one less battalion of 2S3s and a little over one thousand personnel total. This was the standard model by the late 1980s, however not all artillery regiments had yet to conformed to it and one or more of the battalions might have used older weapon systems like the D-30 howitzer. Each regiment was led by a command control battery and included an artillery reconnaissance battery, motor transport company, maintenance company, regimental medical point, chemical protection platoon and supply and service platoon.[12]

SAM Regiment

The SAM regiment was an important part of a SA-8 Gecko as an alternative. Each missile battery, along with the regimental headquarter and missile technical battery, were also equipped with three MANPADs, either the SA-7 Grail, SA-14 Gremlin or SA-16 Gimlet. Besides the missile technical battery, other support subunits included an artillery reconnaissance battery, motor transport company, maintenance company and chemical protection platoon.[13]

Antiaircraft Artillery Regiment

Antiaircraft artillery (AAA) regiments in the late 1980s took the place of SAM regiments in divisions which were assigned to rear areas. These were equipped with twenty-four MANPADs, either the SA-7 Grail, SA-14 Gremlin or SA-16 Gimlet. Additional subunits include a command and control battery and service battery.[14]

Irish Army

The Irish Army field artillery units are called regiments. They are divided into batteries and together the regiments form the Artillery Corps.

Air Defence units are organised as a single regiment with individual batteries stationed around the country.

See also


  1. ^ Page39, Vol XXIII, Encyclopædia Britannica, 11th Edition
  2. ^ VILLATORO, MANUEL P. (23 July 2014). "El regiment más antiguo de Europa empezó siendo un tercio español y combatió contra Napoleón">El regiment más antiguo de Europa empezó siendo un tercio español y combatió contra Napoleón". abc. Retrieved 24 July 2014. 
  3. ^ Historia del Regimiento Inmemorial del Rey no 1
  4. ^ p. 72 Westcote, Thomas A View of Devonshire in MDCXXX: With a Pedigree of Most of Its Gentry W. Roberts, 1845 - Devon (England) -
  5. ^ Christopher Duffy, pages 110 & 121 The Military Experience in the Age of Reason, ISBN 1-85326-690-6
  6. ^ Flynn, G.J. (June 2010). "Lt. General" (PDF). Marine Corps Operating Concepts (Third Edition): 24. Retrieved May 4, 2013. 
  7. ^ These claims are contested on various points of precedence; see FAQ: Regiments, in general and especially: FAQ: Oldest Regiment in the British Army Archived April 4, 2013 at the Wayback Machine
  8. ^ the word had common etymology with the Scandinavian fólk that in the ancient times meant something akin to a gathering of armed people
  9. ^ US Army, FM 100-2-3 The Soviet Army: Troops, Organization and Equipment, Paragraph 4-3
  10. ^ US Army, FM 100-2-3 The Soviet Army: Troops, Organisation and Equipment, 4-46
  11. ^ US Army, FM 100-2-3 The Soviet Army: Troops, Organisation and Equipment, 4-109
  12. ^ US Army, FM 100-2-3 The Soviet Army: Troops, Organization and Equipment, 4-50
  13. ^ US Army, FM 100-2-3 The Soviet Army: Troops, Organisation and Equipment, 4-62
  14. ^ US Army, FM 100-2-3 The Soviet Army: Troops, Organisation and Equipment, 4-104
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